Herb said there's no obvious indications that the shooting is gang- or drug-related. Police, Herb said, also didn't receive any reports of a disturbance before the shooting.

"At this point, it's a complete whodunit," Herb said.

Shortly after 10:10 p.m., police received a report of shots fired in the 2200 block of B Street, Herb said. A caller, Herb said, reported hearing the shots and seeing a man down in front of a fourplex home.

Officers arrived within two minutes and found Guzman down, Herb said. Efforts to resuscitate Guzman were unsuccessful, and he died at the scene.

Michael Larkin, 52, said he was watching television in the front room of his home, when he heard what he believed was three gunshots in rapid succession and a loud moaning noise coming from next door.

Larkin said he didn't see the shooting or hear any cars or any type of disturbance before the shooting.

After the shots, Larkin sprang up, told his wife to call 9-1-1 and went outside. There, Larkin couldn't see anything because it was so dark, he said, but he heard what "sounded like a dog growling on the ground."

Another neighbor from across the street, Tony Meyer, 34, also reportedly came outside after hearing the shots and had a flashlight. Meyer, who didn't see the shooting, said it was black outside, but he could see a cell phone glowing from the residence across the street.

Together, Larkin said they approached the taupe-colored fourplex and saw a man lying facedown, his head resting on some of the building's stairs. The cellphone, Meyer said, was open near him.

Larkin said he saw a red stain on the light-colored fabric of the man's T-shirt or undershorts and believed the stain was blood from a wound. The spot was the only possible injury Larkin said he could see on the man, who appeared to be dressed in all dark clothing.

Larkin said he heard the man gasp and saw that he appeared to be shivering. Meyer said at one point the man appeared to be convulsing.

"I didn't know what to do," Meyer said.

Larkin said he didn't attempt CPR. He said he didn't know the man, and that he doesn't know many of the people who live in the fourplex.

Meyer said he didn't know the man either, but had seen him before and believed he had lived in the fourplex for more than a year. He also said he didn't see or hear anything prior to the shooting.

"There's a lot of neighbors with a lot of questions," Meyer said.

Investigators, Larkin said, set up large lights around the area. Larkin said he saw police working outside late into the night. "It was hard to go to sleep after that," he said.

Investigators remained at the scene past 4 a.m., canvassing the area and interviewing family and witnesses, Herb said. Police aren't yet saying how many times Guzman was shot.

Detectives, Herb said, have received differing witness accounts, including people saying they saw someone run from the area and leave in a vehicle.

A woman, whom The Oregonian is not identifying for her safety, said she was sitting on her couch, when she heard some yelling, which sounded muffled, then, "pop, pop, pop." At first, she assumed the pops were fireworks, she said. The woman said she looked out her window and saw two young men running to what appeared to be a dark-colored van parked down the street.

The vehicle, she said, had its lights on and was running. The two men jumped in the vehicle, which swiftly pulled away, and headed right down 22nd Avenue from B Street, she said. Soon, she saw police arrive.

She said she wasn't able to get a good suspect description or a license plate on the vehicle.

Tuesday afternoon, the woman said she left the single soft pink rose that was lying just off the fourplex's muddy driveway. She left the rose in a painted hot-pink circle, a marking she believed was part of the crime scene. She was in tears as she stood in front of the residence.

"I want his family to know I care," said the woman, who was shaking. "I've been crying about it all morning – it's just so sad...I wish I could meet them and tell them how much I care."

Anyone with information about the incident, people associated with Guzman, or Guzman's whereabouts prior to the shooting is asked to call Forest Grove police at 503-992-3260.